Veterinarians know what cats are like. That’s why so many veterinarian clinics display funny and insightful messages about cats for passer-bys to enjoy.
Humor about cats stems from knowing their behavior and disposition. In general, cats don’t care about you and only care about themselves, so that makes them little different than most people. The only difference is that while cats are cute when they’re ignoring you, people aren’t so nice when they’re doing the same thing, which goes to show you that cats are far superior as a result.